The Indonesian Meteorology, Climatology and Geophysics Agency (BMKG) has issued warnings regarding potential high waves in the waters west of the Nias Islands, the waters west of the Batu Islands, and the Indian Ocean west of the Nias Islands in North Sumatra. These hazardous maritime conditions are expected to occur from April 19 to 22, 2026.
Maritime Risks and Navigation Warnings
Wave heights in these three specific areas could reach between 1.25 and 2.5 meters. Rizky Ramadhan, a forecaster at the BMKG Belawan Maritime Meteorology Station in Medan, emphasized that these conditions must be closely monitored as they could disrupt navigation, particularly for small boats.
Fishermen operating small boats are advised to exercise caution if wind speeds reach 15 knots and waves hit 1.25 meters. Similarly, operators of barges are urged to increase vigilance if wind speeds reach 16 knots and waves reach 1.5 meters.
Current wind patterns show northern Indonesia moving from northwest to northeast, while southern regions see winds moving from northeast to southeast. Both regions are experiencing wind speeds between 9 and 15 knots.
Regional Weather Forecast for North Sumatra
On the morning of Sunday, April 19, conditions are expected to be cloudy with potential light rain in South Nias, Labuhanbatu, and South Labuhanbatu. From noon through the evening, light to heavy rain could occur fairly evenly across North Sumatra.
Rainfall is likely to continue into the night across the region, with heavy rain specifically possible in Pakpak Bharat and surrounding areas. By the early morning, cloudy skies and light rain may affect several areas, including North Tapanuli, Central Tapanuli, Dairi, and Sibolga.
Average air temperatures are expected to range from 15 to 33 degrees Celsius, with humidity levels between 79 and 99 percent. Winds are blowing from the east to southwest at speeds of 3-6 km per hour.
Potential for Hydrometeorological Disasters
The BMKG has warned of moderate to heavy rain on the west coast, eastern slopes, the east coast, and the mountains of North Sumatra. These weather patterns could lead to flooding, landslides, and other hydrometeorological disasters.
Frequently Asked Questions
Which maritime areas are affected by high waves?
The affected areas include the waters west of the Nias Islands, the waters west of the Batu Islands, and the Indian Ocean west of the Nias Islands in North Sumatra.
What are the specific warnings for small boats and barges?
Small boat fishermen should exercise caution if wind speeds reach 15 knots and waves reach 1.25 meters. Barge operators should increase vigilance if wind speeds reach 16 knots and waves reach 1.5 meters.
What land-based risks are associated with the current weather?
Moderate to heavy rain in the mountains, west coast, east coast, and eastern slopes of North Sumatra could potentially cause landslides and flooding.
How does your community prepare for the arrival of extreme weather and high sea conditions?
